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Can't Find Plug To Connect Tekonsha Trailer Wiring 118255 To In 2017 Lexus RX 350  

Updated 11/14/2025 | Published 08/26/2019

Question:

Hello. Trying to find the location where to plug in the ModuLite unit. Opened access in the rear on the right, but nowhere to connect. What am I missing? Where is is located? Lexus rx350 2017

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Expert Reply:

The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118255 is designed for a 2017 Lexus RX 350 without a tow package. Since the vehicle does not have a tow package there should be a 10-pin connector located behind the rear interior trim panel. It looks like you have found it but it is already connected to something which makes me think you already have a tow package if that is the correct 10 pin connector.

If that is the case you should be able to plug the wire loom 4-way section of wiring with the gray plug on the end to the factory tow harness connector behind the bumper. If you are able to plug in the gray plug into the connector behind the bumper and it works then you actually have a tow package. I have attached an installation video that shows where the gray plug plugs into.

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Heather A
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Rich profile picture

Rich

11/14/2025

Thank you so much. I've been beating myself up looking for it. Much appreciated. Thank you

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